Spec Sheet Preview: The Alpha Communications® / Golmar D4L-G/POE 4-Port PoE Switch is used exclusively with the G+ series TCP/IP video-intercom systems. The D4L-G/POE provides 4 ports for the various PoE devices on the G+ system(s). The D4L-G/POE requires the FA-G power supply for power. Each FA-G power supply can power up to two (2) of the D4L-G/POE PoE switches.